Process of treating wood.



Aims .elaw

PRUCESS (7F TREfi-TIFHE WDUD.

mama -1111M 1i iii? i No Brewing.-

To all whom 2'23 may cmwem:

Be is known that I, LAURlTZ PETERSEN- Hviim, citizen of the Kingdom ofDenmark, and residing in the village of Keen-up, near Copenhagen,Denmark, have invented new and useful improvements in Pwcesses ofTreating V1 0041, ml which the following is a specification.

Iii. is a well-known fact that Wood which is subjected to bailing duringtreatment with liquids may easii-y be partly or entirely desm'oyecl; nomatter Whether this treatment takes place under normal pressure 01'under a pressure sf several amnosplieres, or whether this pi'ecess usedto soften the wood, or to give it e eeeteinione of @0101, or 30 give itother preperiiies since a large portion of the Wendy fiber will beT'JZYLDSfOllDEd into acetone combinations, and, at high ten1- perzatmes,will e11 be transformed into tarlike substances. Attempts have been madein obviate this by boiling the zv'eed in eliam line liquids, which, ifplESFJli in the proper ii iinntities coi'istexiitiy i'ielitmlize the ganer see-(i aeei'flus (:mnbinmhiens (acetic amid, fill mi!) eekh eta 210,presence of "whim acids es eeialiy m the weotl-fiiiieis m be la-C011):'p(isefl,'oit ti'ans'lnrmed. This metlmii, however, has the disadvantageihni iii" i used :iliuilis m the salts remain in lie weed alley beingSiliijfiififll to lieilie madly, that the rev ullmiirc n greatquantifies at he lieegizming oil the 0pereeion have a ileeempusm 'zel';on ilie iig- 11in, at the same time that the u. impregnating, O1snftening liquid igaila-iiiy iii) sm'bs so many salts fl-03:1 the mithat it iJQKOmP/S useless.

The present. invention has as its elijevt to obviate these disadvantagesby providing for a constane liliei'aaioiti, during the process, of theelkslis used for the neutxulimtinn of the, generated livid (or acetone)eoxiibinzitions; 50 that the zillmlis only need #10 be pres ent incon'ipiu'zitively small quantities.

It is :1 well--lm0wn fact time several kinds of wood, by means of hightemperatures, no matter whether these temperatures are at mined by mm115 of steam or heeled gases, will take a, brownish ianne, but also, insuch' ream Patent. E emnenseiil 3H3,

Application filed December $3, 131 3. Eerie Ho. 809,526.

cases, there i'j-ekes place an active eiesiruction oi the wood, whichiiGSiDTUCtlOD 1S first introdiweci by the formeiien of acetic acid andfeimic acid, em, lifter which the desfiruefion (if size weed by thepresence of these acids first properly makes headway, and the Wood,after imminent i'JQiQlllQ-S brittle end. useless for industrial prarpo:In order to Oldviate this, use, was: d to my inventiom gaseous ammenia,which A; psi-silly introduced inte the Weed in any kiieivn manner preiieus (3e healing, and pawl during the heating process is instantlyinti'ecliiceil inte the use? where fiche Weed is treated. herein in suchcases, there would be used "too large a qlmntiiy 0f expensive ammonia,and the surface of the Wood else be too strongly affected, theliberetecl emmenia is re enev etecl continually ontiie bottem of thetank. in the feilewing manner: At a ceiitain moziieiii; timing sheepem'tien there is introiliiced. into the sank a nonvolatile alkaliinsizence sodium hydrexid selutien. The ammeniesalts formed in the Weedeie sweeiecl 011i; 0: driven one by steamizig OZ heating the Weed andmix. themselves Wiili. the sodium liiyli'oxid solution p s 1%, whenfliiey are deeempese'd, and the m i e s mi e is finished the Weed thedesired eeler-tc-ne and. IBiZMYlS l aim 'smldesire 7Z0 see re by Le ters.L tent, is:

lmeess ef' treating WOOCl eonsiseing in subjeciing the material be theaetien 0f highly heated steam, and introducing; aim monin gas into theheeeclkinaferial in the presence of a solution of in alkali hydi'eiqidfor regenerating ammonia from the salts formed during the grasses, bythe clecompesition of said salts in the Dresence of said base,substantially described.

In testimony wheiteef I e'ffi-x my signature in presence of tweWitnesses.

LAURITZ PETERSEN-HVHD. lVitnesses: I

QI-IAI'KIAES HUDE, VILHELM MARTENS.

suitable quantity elf beeemee free and can

